I believe it is government policy or correctness to advertise a contract when renewal time is on the horizon. It's a procedure to see what pops out of the "wood work" This leads to new ideas and innovation.
There would be no reason for the contract not to be renewed in Sky Traders favour as they have proven the A319, CASA 212 on skis, bring helicopters into the fold. Kiddies can operate drones, so no issue there.
The existing A319's would be very low time, and low cycle, and providing all performance KPI's have been met; then continue on ........................